<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>访问出错</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" href="/bootstrap.min.css" />
    <link rel="stylesheet" href="/style.css" />
  </head>
  <body>
    <main>
      <div class="container">
        <div class="col-md-6 align-self-center">
          <h1>404</h1>
          <a href="/">
            <button class="btn green">返回首页</button>
          </a>
        </div>
      </div>
    </main>
  </body>
</html>
